US5807424A - Regenerative adsorption filter bed for exhauster hoods - Google Patents

Regenerative adsorption filter bed for exhauster hoods Download PDF

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US5807424A
US5807424A US08/491,674 US49167495A US5807424A US 5807424 A US5807424 A US 5807424A US 49167495 A US49167495 A US 49167495A US 5807424 A US5807424 A US 5807424A
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filter
odor filter
odor
absorbent
filter bed
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Ernest de Ruiter
Jonas Tornblom
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Bluecher GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28016—Particle form
    • B01J20/28019—Spherical, ellipsoidal or cylindrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1669—Cellular material
    • B01D39/1676—Cellular material of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
    • B01J20/28004—Sorbent size or size distribution, e.g. particle size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28042—Shaped bodies; Monolithic structures
    • B01J20/28045—Honeycomb or cellular structures; Solid foams or sponges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28057—Surface area, e.g. B.E.T specific surface area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28069—Pore volume, e.g. total pore volume, mesopore volume, micropore volume
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28078—Pore diameter
    • B01J20/28085—Pore diameter being more than 50 nm, i.e. macropores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28095—Shape or type of pores, voids, channels, ducts
    • B01J20/28097—Shape or type of pores, voids, channels, ducts being coated, filled or plugged with specific compounds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2035—Arrangement or mounting of filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/13—Polyurethane filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/42—Foam filter materials

Definitions

  • the invention relates to a regenerative adsorption filter bed, and more particularly to a regenerative adsorption filter bed for use in exhauster hoods.
  • Exhauster hoods are widely used to purify fumes laden with odor-intensive substances, especially greasy substances, which are produced, in particular, during cooking. After filtration, the purified air can be returned to the cooking area (recirculation filter) or blown out of the building into the outside air (exhaust filter).
  • the adsorbent most often used in odor filters of this type is activated charcoal, which is usually present in the form of a coating on porous mats.
  • activated charcoal which is usually present in the form of a coating on porous mats.
  • a highly air-permeable material such as a fleece or a thin plastic foam, is first sprayed or soaked with an activated charcoal that has been mixed with a binding agent dispersion and ground with water slurry, and is then squeezed out.
  • these filters have only a short useful life, because their adsorption capacity is low, due to the small amount of activated charcoal used and the partial clogging of its pores by the binding agent.
  • the odor filter consists of a loose packing of activated charcoal.
  • the adsorption capacity is improved in these filters, the adsorption kinetics deteriorate, due to the larger activated charcoal particles, and the filter causes a high pressure loss.
  • filters based on the "expanded fixed bed” principle small adsorbent particles (activated charcoal granules or pellets having a particle size of 0.3 to 1 mm) are affixed to an open substrate structure (large-pored reticulated plastic foam), which is usually shaped like a flat sheet.
  • open substrate structure large-pored reticulated plastic foam
  • filter materials of this type which are available as sheets having a thickness of up to 30 mm, have significantly lower pressure loss and, thanks to an activated charcoal quantity of approximately 200 g/l, increased capacity and performance. Their useful life also increases.
  • an odor filter for exhauster hoods comprised of an adsorption filter bed regenerable by washing, made of a highly air-permeable substrate material and an adsorbent material affixed thereto in the amount of 50 to 400 g/l by means of an adhesive mass and having a mean particle diameter between 0.2 and 2 mm.
  • the adsorption filter bed used according to the invention for exhauster hoods is regenerated by washing. This is preferably accomplished by a washing operation that may be carried out in any known manual or mechanized manner.
  • the filter is washed in a commercially available dish washing machine.
  • unwanted substances which still adhere to the filter material or cover or clog its pores, as well as substances adsorbed in the pores, are removed. These unwanted substances are usually fats or dust particles.
  • the substances, for the most part, are completely removed in the washing process, while the adsorbent characteristics of the active material in the filter bed are maintained without loss.
  • the actual washing process may also be followed by one or more rinsing steps. Regeneration can be carried out more than once, preferably more than fifty times, without any significant loss being detected in adsorption capacity and/or adsorption kinetics.
  • FIG. 1 is a partial schematic cross-sectional view of the inventive odor filter
  • FIG. 2 is a plan view of the filter.
  • the adsorption filter bed is shaped like a flat sheet 5 having a layer thickness of 6 to 40 mm, preferably 10 to 30 mm.
  • a filter may consist of a plurality of these adsorption filter beds.
  • the flat adsorption filter bed has elongated indentations (e.g., in a V-shape).
  • This layer is then placed in the interior of cylindrical holders in such a way that the edges of the indentations, each of which is arranged in the axial direction, touch one another. This prevents the adsorbent particles from becoming compressed in the inner area of the filter bed; otherwise, densification would lead to increased air resistance.
  • Such filter elements are used, in particular, in exhauster hoods in large-scale kitchens.
  • the highly air-permeable substrate material is an open-pored plastic foam.
  • This open-pored plastic foam may be an open-pored reticulated polyurethane foam, preferably an open-pored reticulated polyurethane foam having a liter weight of 20 to 60 g and a pore size of 1.5 to 3 mm.
  • the foam may have a porosity of 8 to 30 ppi.
  • the adsorption filter bed is arranged in the exhauster hood, through slight compression, in a seal-free and frame-free fashion.
  • the foam loaded with the adsorbent should have a compressibility of at least 2% under a pressure of 1 to 10 N/cm 2 .
  • the filter bed 1 has a thickness 2, an inlet side 3 and an outlet side 4.
  • Activated charcoal carbonized and then activated material originating from vegetable raw materials--wood, peat, hard coal, etc.
  • Spherical activated charcoal from coal-tar pitch or petroleum residues having a diameter of 0.2 to 2 mm, preferably 0.3 to 1 mm, and/or an inner surface (determined using the BET method) of at least 900 m 2 /g (such spherical activated charcoal is described, for example, in GB-B-1 525 420, GB-B-2 012 257, GB-A 2 025 385 and GB-A-2 053 176),
  • Splint or granular coal having a particle size of 0.2 to 2 mm, preferably 0.3 to 1.0 mm, and an inner surface of at least 900 m 2 /g (such coal is described, for example, in "Activated Charcoal and its Industrial Application” "Aktivkohle und Hä von für”! by H. von Kienle, E. Baeder, Gustav Enke Verlag, Stuttgart, 1980),
  • Carbonized and activated porous polymers based on sulfonated styrene-divinyl-benzol copolymers or styrene-acrylic acid copolymers are described, for example, in U.S. Pat. No. 4,040,990, U.S. Pat. No. 4,224,415 and U.S. Pat. No. 4,957,897),
  • Carbonized and activated ion exchangers based on sulfonated styrene-divinyl-benzol copolymers or styrene-acrylic acid copolymers (the manufacture of activated charcoal from ion exchangers of this type is described, for example, in DD-B-063 768 and DE-A-43 04 026) or carbonized and activated anion exchangers based on polystyrene resins or polyacrylic resins having tertiary or quaternary amino groups, particularly ion exchangers of the gel type (such ion exchangers are described, for example, in DE-A-43 28 219),
  • Porous (non-carbonized) polymers based on a copolymer of styrene and divinyl benzol cross-linked via CH 2 bridges (as sold by the Dow Chemical Corp, for example, under the tradename Sorbathene®),
  • Form particles of molecular sieves preferably hydrophobic molecular sieves having an SiO 2 /Al 2 O 3 module of >10 (as sold by Degussa AG, for example, under the name DAY-Zeolith).
  • the adsorbent may be worked into the PU foam according to DE-A-38 13 563, for example.
  • spherical charcoal leads to an increased useful life and/or adsorption capacity, compared to activated charcoal.
  • the following is used as the adsorbent: acid-impregnated activated charcoal, spherical activated charcoal, splint or granular coal or acid-impregnated activated charcoal from carbonized and activated cation exchangers, anion exchangers or porous polymers. Impregnation is carried out, for example, using phosphoric acids for the adsorption of ammonia and amines. By using adsorbent materials of this type, it is possible to effectively neutralize unpleasant fish odors, in particular.
  • the filter bed used according to the invention consists of a plurality of adsorption filter beds placed one atop the other, these beds may have the same or different characteristics in respect to thickness, adsorbent or adhesive mass, and, in particular, impregnation.
  • the adsorption material especially activated charcoal as described above
  • acid When the adsorption material, especially activated charcoal as described above, is impregnated with acid, it has proved effective to impregnate the regenerated adsorption filter bed again after the washing process or after the final rinse, in order to counteract any possible loss in weight caused by washout.
  • This post-impregnation may also be carried out in the final rinsing bath, for example by using commercially available vinegar.
  • the regenerative ability of the adsorption filter for exhauster hoods leads to a very advantageous cost/benefit relationship.
  • the adsorption filter bed contains 50 to 400 g/l, preferably 150 to 350 g/l, of adsorbent.
  • a particle size of the adsorbent material may be used which is at least three times smaller than the pore diameter of the substrate material.
  • the adsorbent applied to the air-permeable substrate material may have a mean particle diameter of 0.3 to 1 mm.
  • the adsorbent may also be applied in a quantity between 100 to 300 g/l, relative to the volume of the substrate material.
  • the quantity of the adhesive mass used in the adsorption filter bed may equal the weight of the highly air-permeable substrate material ⁇ 50%.
  • Organic cross-linkable polymers may be used as the adhesive mass, for example: derivatives of acrylic acid, polyurethane, polystyrene, polyisocyanate, polyvinyl acetate, or hot-melt adhesive.
  • a pre-polymeric low-solvent two-component system based on masked diisocyanates and/or polyisocyanates, which are cross-linked to diamines and/or polyamines is used as the adhesive mass.
  • This adhesive mass has good initial adherence and displays a marked viscosity minimum during the cross-linking phase, resulting in optimal adherence.
  • This viscosity minimum of the adhesive mass reduces the contact surface between the substrate material and the adsorbent to a minimum, so that the high air permeability of the substrate material is maintained.
  • These systems preferably use the products sold by BAYER AG under the name "IMPRANIL® High Solid PURE Reactive Products.”
  • a further preferred adhesive mass consists of non-masked polymeric diisocyanates and/or polyisocyanates, such as those sold by BAYER AG under the name Levacast Addukt 43131 N, for example.
  • the cross-linking reaction is initiated by the moisture present in the adsorbent.
  • a grease filter is arranged before the adsorption filter bed in the direction of flow.
  • the invention also relates to a process for regenerating an adsorption filter bed for exhauster hoods, wherein the regeneration consists of a washing operation. This regeneration may be carried out by washing in an automatic dishwasher.
  • the adsorption filter bed containing the impregnated adsorbent may also be impregnated again with an acid after the washing process.
  • the earlier statements in respect to the impregnation and the acid also apply here.

Abstract

An odor filter for exhauster hoods, which filter includes an adsorption filter bed regenerable by washing. The filter bed is made of a highly air-permeable substrate material and an adsorbent affixed thereto in the amount of 50 to 400 g/l by an adhesive mass and has a mean particle diameter between 0.2 and 2 mm.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a regenerative adsorption filter bed, and more particularly to a regenerative adsorption filter bed for use in exhauster hoods.
2. Description of the Prior Art
Exhauster hoods are widely used to purify fumes laden with odor-intensive substances, especially greasy substances, which are produced, in particular, during cooking. After filtration, the purified air can be returned to the cooking area (recirculation filter) or blown out of the building into the outside air (exhaust filter).
All exhauster hoods have grease filters that separate out the easily combustible fats, in order to reduce the danger of fire. Exhauster hoods that return the air to the kitchen and exhauster hoods in larger kitchens (hotels or restaurants) that carry air away to the outside must also have odor filters, in order to protect the immediate premises as well as neighboring buildings against annoying odors.
The adsorbent most often used in odor filters of this type is activated charcoal, which is usually present in the form of a coating on porous mats. To create these filters, a highly air-permeable material, such as a fleece or a thin plastic foam, is first sprayed or soaked with an activated charcoal that has been mixed with a binding agent dispersion and ground with water slurry, and is then squeezed out. However, these filters have only a short useful life, because their adsorption capacity is low, due to the small amount of activated charcoal used and the partial clogging of its pores by the binding agent.
In another known form, the odor filter consists of a loose packing of activated charcoal. Although the adsorption capacity is improved in these filters, the adsorption kinetics deteriorate, due to the larger activated charcoal particles, and the filter causes a high pressure loss.
The performance of these filters is improved through the use of filters based on the "expanded fixed bed" principle. According to this principle, small adsorbent particles (activated charcoal granules or pellets having a particle size of 0.3 to 1 mm) are affixed to an open substrate structure (large-pored reticulated plastic foam), which is usually shaped like a flat sheet. Compared to the filters mentioned above, filter materials of this type, which are available as sheets having a thickness of up to 30 mm, have significantly lower pressure loss and, thanks to an activated charcoal quantity of approximately 200 g/l, increased capacity and performance. Their useful life also increases. It remains limited, however, not only by saturation with odorous substances, but also by blocking of the adsorbent transport pores through fats not eliminated by the grease filter. Despite the aforementioned advantages, these filters are not in widespread use, because the cost of procuring them is too high relative to their effective useful life.
SUMMARY AND DESCRIPTION OF THE INVENTION
Accordingly, it is an object of the present invention to provide a filter for exhauster hoods which, along with high adsorption capacity and kinetics, also has a long effective useful life.
Pursuant to this object, and others which will become apparent hereafter, one aspect of the present invention resides in an odor filter for exhauster hoods, comprised of an adsorption filter bed regenerable by washing, made of a highly air-permeable substrate material and an adsorbent material affixed thereto in the amount of 50 to 400 g/l by means of an adhesive mass and having a mean particle diameter between 0.2 and 2 mm.
The adsorption filter bed used according to the invention for exhauster hoods is regenerated by washing. This is preferably accomplished by a washing operation that may be carried out in any known manual or mechanized manner. Preferably, the filter is washed in a commercially available dish washing machine. In this way, unwanted substances which still adhere to the filter material or cover or clog its pores, as well as substances adsorbed in the pores, are removed. These unwanted substances are usually fats or dust particles. The substances, for the most part, are completely removed in the washing process, while the adsorbent characteristics of the active material in the filter bed are maintained without loss. The actual washing process may also be followed by one or more rinsing steps. Regeneration can be carried out more than once, preferably more than fifty times, without any significant loss being detected in adsorption capacity and/or adsorption kinetics.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partial schematic cross-sectional view of the inventive odor filter; and
FIG. 2 is a plan view of the filter.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
According to a preferred embodiment of the invention, the adsorption filter bed is shaped like a flat sheet 5 having a layer thickness of 6 to 40 mm, preferably 10 to 30 mm. Furthermore, a filter may consist of a plurality of these adsorption filter beds.
In a further embodiment, the flat adsorption filter bed has elongated indentations (e.g., in a V-shape). This layer is then placed in the interior of cylindrical holders in such a way that the edges of the indentations, each of which is arranged in the axial direction, touch one another. This prevents the adsorbent particles from becoming compressed in the inner area of the filter bed; otherwise, densification would lead to increased air resistance. Such filter elements are used, in particular, in exhauster hoods in large-scale kitchens.
In a particular embodiment according to the invention, the highly air-permeable substrate material is an open-pored plastic foam. This open-pored plastic foam may be an open-pored reticulated polyurethane foam, preferably an open-pored reticulated polyurethane foam having a liter weight of 20 to 60 g and a pore size of 1.5 to 3 mm. The foam may have a porosity of 8 to 30 ppi.
In a further embodiment of the present invention, the adsorption filter bed is arranged in the exhauster hood, through slight compression, in a seal-free and frame-free fashion. For this purpose, the foam loaded with the adsorbent should have a compressibility of at least 2% under a pressure of 1 to 10 N/cm2.
As shown in FIG. 1, the filter bed 1 has a thickness 2, an inlet side 3 and an outlet side 4.
The following may be used as the adsorbent:
Activated charcoal (carbonized and then activated material originating from vegetable raw materials--wood, peat, hard coal, etc.),
Spherical activated charcoal from coal-tar pitch or petroleum residues having a diameter of 0.2 to 2 mm, preferably 0.3 to 1 mm, and/or an inner surface (determined using the BET method) of at least 900 m2 /g (such spherical activated charcoal is described, for example, in GB-B-1 525 420, GB-B-2 012 257, GB-A 2 025 385 and GB-A-2 053 176),
Splint or granular coal having a particle size of 0.2 to 2 mm, preferably 0.3 to 1.0 mm, and an inner surface of at least 900 m2 /g (such coal is described, for example, in "Activated Charcoal and its Industrial Application" "Aktivkohle und ihre industrielle Anwendung"! by H. von Kienle, E. Baeder, Ferdinand Enke Verlag, Stuttgart, 1980),
Carbonized and activated porous polymers based on sulfonated styrene-divinyl-benzol copolymers or styrene-acrylic acid copolymers (such carbonized polymers are described, for example, in U.S. Pat. No. 4,040,990, U.S. Pat. No. 4,224,415 and U.S. Pat. No. 4,957,897),
Carbonized and activated ion exchangers based on sulfonated styrene-divinyl-benzol copolymers or styrene-acrylic acid copolymers (the manufacture of activated charcoal from ion exchangers of this type is described, for example, in DD-B-063 768 and DE-A-43 04 026) or carbonized and activated anion exchangers based on polystyrene resins or polyacrylic resins having tertiary or quaternary amino groups, particularly ion exchangers of the gel type (such ion exchangers are described, for example, in DE-A-43 28 219),
Porous (non-carbonized) polymers based on a copolymer of styrene and divinyl benzol cross-linked via CH2 bridges (as sold by the Dow Chemical Corp, for example, under the tradename Sorbathene®),
Form particles of molecular sieves, preferably hydrophobic molecular sieves having an SiO2 /Al2 O3 module of >10 (as sold by Degussa AG, for example, under the name DAY-Zeolith).
The application of spherical charcoal to an air-permeable substrate material is described, for example, in DE-A-33 04 349 and EP-B 118 618.
The adsorbent may be worked into the PU foam according to DE-A-38 13 563, for example.
The use of spherical charcoal leads to an increased useful life and/or adsorption capacity, compared to activated charcoal.
In addition, practically no abrasion occurs during the regeneration process when spherical charcoal is used, due to its hard surface. Even under rough washing conditions, no material loss--and thus none of the loss in adsorption capacity and kinetics associated with material loss--is observed.
According to a preferred embodiment of the invention, the following is used as the adsorbent: acid-impregnated activated charcoal, spherical activated charcoal, splint or granular coal or acid-impregnated activated charcoal from carbonized and activated cation exchangers, anion exchangers or porous polymers. Impregnation is carried out, for example, using phosphoric acids for the adsorption of ammonia and amines. By using adsorbent materials of this type, it is possible to effectively neutralize unpleasant fish odors, in particular.
When the filter bed used according to the invention consists of a plurality of adsorption filter beds placed one atop the other, these beds may have the same or different characteristics in respect to thickness, adsorbent or adhesive mass, and, in particular, impregnation.
When the adsorption material, especially activated charcoal as described above, is impregnated with acid, it has proved effective to impregnate the regenerated adsorption filter bed again after the washing process or after the final rinse, in order to counteract any possible loss in weight caused by washout. This post-impregnation may also be carried out in the final rinsing bath, for example by using commercially available vinegar. The regenerative ability of the adsorption filter for exhauster hoods leads to a very advantageous cost/benefit relationship.
In a preferred embodiment according to the invention, the adsorption filter bed contains 50 to 400 g/l, preferably 150 to 350 g/l, of adsorbent.
In particular, a particle size of the adsorbent material may be used which is at least three times smaller than the pore diameter of the substrate material.
The adsorbent applied to the air-permeable substrate material may have a mean particle diameter of 0.3 to 1 mm. The adsorbent may also be applied in a quantity between 100 to 300 g/l, relative to the volume of the substrate material.
The quantity of the adhesive mass used in the adsorption filter bed may equal the weight of the highly air-permeable substrate material ±50%. Organic cross-linkable polymers may be used as the adhesive mass, for example: derivatives of acrylic acid, polyurethane, polystyrene, polyisocyanate, polyvinyl acetate, or hot-melt adhesive.
According to another embodiment of the invention, a pre-polymeric low-solvent two-component system based on masked diisocyanates and/or polyisocyanates, which are cross-linked to diamines and/or polyamines, is used as the adhesive mass. This adhesive mass has good initial adherence and displays a marked viscosity minimum during the cross-linking phase, resulting in optimal adherence. This viscosity minimum of the adhesive mass reduces the contact surface between the substrate material and the adsorbent to a minimum, so that the high air permeability of the substrate material is maintained. These systems preferably use the products sold by BAYER AG under the name "IMPRANIL® High Solid PURE Reactive Products."
A further preferred adhesive mass consists of non-masked polymeric diisocyanates and/or polyisocyanates, such as those sold by BAYER AG under the name Levacast Addukt 43131 N, for example. The cross-linking reaction is initiated by the moisture present in the adsorbent.
In a further embodiment according to the invention, a grease filter is arranged before the adsorption filter bed in the direction of flow.
The invention also relates to a process for regenerating an adsorption filter bed for exhauster hoods, wherein the regeneration consists of a washing operation. This regeneration may be carried out by washing in an automatic dishwasher.
The adsorption filter bed containing the impregnated adsorbent may also be impregnated again with an acid after the washing process. The earlier statements in respect to the impregnation and the acid also apply here.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, and specific objects attained by its use, reference should be had to the drawing and descriptive matter in which there are illustrated and described preferred embodiments of the invention.

Claims (41)

I claim:
1. An odor filter for an exhauster hood, comprising an adsorption filter bed regenerable by washing, said filter bed being made of a highly air permeable substrate material, an adsorbent affixed in an amount of 50 to 400 g/l, and an adhesive mass for affixing the adsorbent to the substrate material, said adsorbent having a mean particle diameter between 0.2 and 2 mm.
2. An odor filter as defined in claim 1, wherein the adsorption filter bed has a plurality of layers.
3. An odor filter as defined in claim 1, wherein the adsorption filter bed has a thickness between 6 and 40 mm.
4. An odor filter as defined in claim 3, wherein the thickness of the adsorption filter bed is between 10 and 30 mm.
5. An odor filter as defined in claim 1, wherein the adsorption filter bed has elongated indentations.
6. An odor filter as defined in claim 1, wherein the highly air-permeable substrate material is an open pore plastic foam.
7. An odor filter as defined in claim 6, wherein the open pore plastic foam is an open-pore reticulated polyurethane foam.
8. An odor filter as defined in claim 7, wherein the open pore plastic foam is an open pore reticulated polyurethane foam having a liter weight of 20 to 50 g and a pore size of 1.5 to 3 mm.
9. An odor filter as defined in claim 6, wherein the open pore plastic foam has a porosity of 8 to 30 ppi.
10. An odor filter as defined in claim 1, wherein the adsorption filter bed is compressible so as to be arrangeable in the exhauster hood by compression in a seal-free and frame-free manner.
11. An odor filter as defined in claim 10, wherein the adsorption filter bed is a plastic foam which has a compressibility of at least 2% under a pressure of 1 to 10 N/cm2.
12. An odor filter as defined in claim 1, wherein the absorbent is activated charcoal.
13. An odor filter as defined in claim 1, wherein the absorbent is spherical activated charcoal having a diameter of 0.2 to 2 mm.
14. An odor filter as defined in claim 13, wherein the spherical activated charcoal has a diameter of 0.3 to 1 mm.
15. An odor filter as defined in claim 13, wherein the spherical activated charcoal has an inner surface area of at least 900 m2 /g.
16. An odor filter as defined in claim 1, wherein the absorbent is one of splint and granular coal having a diameter of 0.2 to 2 mm.
17. An odor filter as defined in claim 16, wherein the coal has a diameter of 0.3 to 1 mm.
18. An odor filter as defined in claim 16, wherein the coal has an inner surface area of at least 900 m2 /g.
19. An odor filter as defined in claim 1, wherein the absorbent is a carbonized and activated porous polymer based on one of sulfonated styrene-divinyl-benzol copolymers and sulfonated styrene-acrylic acid copolymers.
20. An odor filter as defined in claim 1, wherein the absorbent is a carbonized and activated cation exchanger based on one of sulfonated styrene-divinyl-benzol copolymers and sulfonated styrene-acrylic acid copolymers.
21. An odor filter as defined in claim 1, wherein the absorbent is a carbonized and activated anion exchanger based on one of polystyrene resins and polyacrylic resins having one of tertiary and quaternary amino groups.
22. An odor filter as defined in claim 1, and further comprising an acidic impregnation agent impregnated in the absorbent.
23. An odor filter as defined in claim 22, wherein the impregnation agent is phosphoric acid.
24. An odor filter as defined in claim 1, wherein the absorbent consists of porous polymers based on a copolymer of styrene and divinyl benzol cross-linked with CH2 bridges.
25. An odor filter as defined in claim 1, wherein the absorbent is formed of form particles of hydrophobic molecular sieves.
26. An odor filter as defined in claim 1, wherein 150 to 350 g/l of the absorbent is contained in the adsorption filter bed.
27. An odor filter as defined in claim 1, wherein the absorbent has a particle size that is at least three times smaller than a pore diameter of the substrate material.
28. An odor filter as defined in claim 1, wherein the absorbent has a mean particle diameter of 0.3 to 1 mm.
29. An odor filter as defined in claim 1, wherein 100 to 300 g/l of the absorbent is affixed to the substrate material, relative to the volume of the substrate material.
30. An odor filter as defined in claim 1, wherein the adhesive mass has a weight equal to that of the substrate material ±50%.
31. An odor filter as defined in claim 1, wherein the adhesive mass contains organic, cross-linkable polymers.
32. An odor filter as defined in claim 31, wherein the organic cross-linkable polymers are selected from the group consisting of derivatives of acrylic acid, polyurethane, polystyrene, polyisocynate and polyvinyl acetate.
33. An odor filter as defined in claim 1, wherein the adhesive mass includes a hot-melt adhesive.
34. An odor filter as defined in claim 31, wherein the adhesive mass includes a prepolymeric low-solvent two-component system based on at least one of masked diisocyanates and polyisocyanates, which are cross-linked to at least one of diamines and polyamines.
35. An odor filter as defined in claim 31, wherein the adhesive mass includes at least one of non-masked polymeric diisocyanates and polyisocyanates.
36. An odor filter as defined in claim 1, and further comprising a grease filter arranged ahead of the adsorption filter bed in a flow direction.
37. A combination comprising an exhauster hood and an odor filter, the odor filter comprising an adsorption filter bed regenerable by washing, said filter bed being formed of a highly air-permeable substrate material and an absorbent affixed thereto in an amount of 50 to 400 g/l by an adhesive mass and having a mean particle diameter between 0.2 and 2 mm, the adsorption filter being compressible and arranged in the exhauster hood under compression in a seal-free and frame-free manner.
38. A process for regenerating an odor filter for an exhauster hood, which odor filter includes an adsorption filter bed formed of a highly air permeable substrate material and an absorbent affixed thereto in an amount of 50 to 400 g/l by an adhesive mass, and having a mean particle diameter between 0.2 and 2 mm, the process comprising the step of regenerating the adsorption filter bed by washing.
39. A process as defined in claim 38, wherein the washing is carried in a dish washing machine.
40. A process as defined in claim 39, and further comprising the step of post-impregnating the adsorption filter bed with an acid after the washing step.
41. A process for filtering odors from air passing through a cooking exhauster hood, comprising the steps of: arranging an adsorption filter bed in the exhauster hood, the filter bed being made of a highly air permeable substrate material, an adsorbent having a mean particle diameter between 0.2 and 2 mm affixed to the substrate material in an amount of 50 to 400 g/l, and an adhesive mass which affixes the adsorbent to the substrate material; and regenerating the filter bed by removing the filter bed from the exhauster hood and washing the filter bed.
US08/491,674 1994-06-17 1995-06-19 Regenerative adsorption filter bed for exhauster hoods Expired - Lifetime US5807424A (en)

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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999036172A1 (en) * 1998-01-20 1999-07-22 Naiad Technologies, Inc. Activated charcoal and open cell foam filtration material, and apparatus and methods of using the same
US6024782A (en) * 1996-11-15 2000-02-15 Dragerwerk Ag Layered gas filter media
US6302946B1 (en) * 1998-08-17 2001-10-16 Flanders Corporation Deodorizing air filter and method of fabricating same
WO2001096648A1 (en) * 2000-06-15 2001-12-20 BSH Bosch und Siemens Hausgeräte GmbH Air-circulating domestic appliance comprising a washable filter
US6447584B1 (en) * 1998-08-20 2002-09-10 Extraction Systems, Inc. Filters employing porous strongly acidic polymers
US20020178923A1 (en) * 2000-05-05 2002-12-05 Extraction Systems, Incorporated Filters employing both acidic polymers and physical-absorption media
US20040255785A1 (en) * 2002-02-22 2004-12-23 Koslow Evan E. Air purifying filter systems for building air supply and respirators useful against nbc attacks
US20050000363A1 (en) * 2001-09-21 2005-01-06 Shinichi Minemura Adsorptive sheet and filter for clarifying air
US20050154379A1 (en) * 2003-01-31 2005-07-14 Innovatech Surgical, Inc. Adjustable laser probe for use in vitreoretinal surgery
US20050241480A1 (en) * 2004-04-28 2005-11-03 Lebowitz Jeffrey L Filter material absorb hydrocarbon
WO2005120594A1 (en) * 2004-06-07 2005-12-22 Dow Global Technologies Inc. Polymers with odor control properties and method for their preparation
US20060169139A1 (en) * 2000-05-05 2006-08-03 Extraction Systems, Inc. Filters employing both acidic polymers and physical-adsorption media
US20060189475A1 (en) * 2005-02-23 2006-08-24 Petrik Viktor I Compositions and methods for recycling of nanostructured sorbents
US20060205830A1 (en) * 2004-04-28 2006-09-14 Foamex L.P. Filter materials for adsorbing hydrocarbons
US20070066697A1 (en) * 2005-08-31 2007-03-22 Gilder Stephen D Strut-reinforced polyurethane foam
US20070078193A1 (en) * 2005-08-31 2007-04-05 Gilder Stephen D Strut-reinforced, reduced VOC polyurethane foam
US20080017036A1 (en) * 2004-03-01 2008-01-24 Eurofilters N.V. Adsorbing Agent, Dust Collection Chamber And Method For Adsorbing Odours
US20090158928A1 (en) * 2007-12-19 2009-06-25 Whirlpool Corporation Squeezable moisture removal device
US20090320681A1 (en) * 2006-07-13 2009-12-31 Entegris, Inc. Filtering system for a semiconductor processing tool
US20100162888A1 (en) * 2007-06-08 2010-07-01 Bluecher Hasso Von Mat-shaped foam material for cleaning and/or filtering air
US20100174006A1 (en) * 2005-09-20 2010-07-08 Sleep Innovations, Inc. Strut-Reinforced, Reduced VOC Polyurethane Foam
US20140013942A1 (en) * 2012-07-13 2014-01-16 Advanced Fuel Research, Inc. Carbon sorbent for reversible ammonia sorption
US10022200B2 (en) 2014-08-25 2018-07-17 Peregrine Surgical, Ltd Microsurgical instrument
US10195470B2 (en) 2013-03-15 2019-02-05 Oy Halton Group Ltd. Water spray fume cleansing with demand-based operation
RU206834U1 (en) * 2021-04-07 2021-09-29 Федеральное государственное бюджетное образовательное учреждение высшего образования «Казанский государственный энергетический университет» Granular filter with porous granules
RU210049U1 (en) * 2021-11-19 2022-03-25 Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный энергетический университет" Granular filter with perforated granules for gas cleaning
US11285421B2 (en) * 2018-04-12 2022-03-29 Electrolux Home Products, Inc. Filter media for filtration of cooking fumes

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19617753A1 (en) * 1996-05-03 1997-11-06 Bluecher Gmbh Filter material for air conditioners, vacuum cleaners etc.
DE19618022A1 (en) * 1996-05-04 1997-11-06 Bluecher Gmbh Restoring the activity of adsorption filters made e.g. of carbon@ filter
DE29709350U1 (en) * 1997-05-28 1997-10-30 Bluecher Gmbh Frame for extractor hoods and filters made with them
DE19938254B4 (en) * 1999-08-12 2004-05-19 Dr. Hielscher Gmbh Process for regenerating adsorbents
DE19957249B4 (en) * 1999-11-27 2005-06-30 AEG Hausgeräte GmbH Method for restoring the cleaning and / or filtering function of an activated carbon filter cassette of a household or kitchen appliance
DE19962253A1 (en) * 1999-12-22 2001-09-13 Bsh Bosch Siemens Hausgeraete Filter cassette for extractor hoods
JP4441227B2 (en) 2003-10-08 2010-03-31 Ｈｏｙａ株式会社 Endoscope for high frequency treatment
DE102005062160A1 (en) * 2005-12-19 2007-06-21 BLüCHER GMBH Activated charcoal for medical use
JP4602952B2 (en) * 2006-08-10 2010-12-22 ニッタ株式会社 Chemical filter
US11434068B2 (en) 2008-09-24 2022-09-06 Restaurant Technologies, Inc. Flame resistant filter apparatus and method
US8277530B2 (en) * 2008-09-24 2012-10-02 Ellis Fibre Usa Grease removal apparatus, systems and methods
US10167137B2 (en) 2008-09-24 2019-01-01 Efip Holdings Lp Flame resistant viscose filter apparatus and method
US9599350B2 (en) 2008-09-24 2017-03-21 Ellis Fibre Usa Flame resistant filter apparatus and method
DE102009011059B4 (en) * 2009-03-02 2016-08-11 BLüCHER GMBH Mobile device for air purification, its use and method for purifying air
ITMI20130414A1 (en) * 2013-03-19 2014-09-20 Elica Spa MODULE FOR EXTRACTOR HOODS.
BE1025990B1 (en) * 2018-02-08 2019-09-10 Novy Nv ODOR FILTER

Citations (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE63768C (en) * Berlin-Leipziger Maschinenfabrik louis goebel & CO. in Berlin O., Alexanderstrafse 14b Machine for filing saw blades
US3381454A (en) * 1962-10-11 1968-05-07 Collo Rheincollodium Koln G M Filter for absorption and adsorption of gases, vapors, odors and the like
US3519708A (en) * 1966-11-21 1970-07-07 Dow Chemical Co Method of forming selectively permeable bodies from flexible polyurethane foam
US3687297A (en) * 1969-07-04 1972-08-29 Kali Chemie Ag Shaped body for filtering and drying of liquids and gases and process of making the same
US3865758A (en) * 1971-09-13 1975-02-11 Teijin Ltd Polyurethane foam filter material containing adsorbent and method of production thereof
US3925248A (en) * 1971-05-11 1975-12-09 Collo Rheincollodium Koln Gmbh Filter medium for gases
JPS5111085A (en) * 1974-07-18 1976-01-28 Nippon Kuringeeji Kk
JPS51138511A (en) * 1975-05-27 1976-11-30 Sony Corp Method for regulating the hardness of metallic tita nium
US4040990A (en) * 1975-02-18 1977-08-09 Rohm And Haas Company Partially pyrolyzed macroporous polymer particles having multimodal pore distribution with macropores ranging from 50-100,000 angstroms
CH597895A5 (en) * 1975-03-24 1978-04-14 Andersen 2000 Inc Filtering (sub)micron solid and liq. particles from fast gas streams
GB1525420A (en) * 1975-09-04 1978-09-20 Sumitomo Chemical Co Process for producing porous carbon
GB2012257A (en) * 1977-12-27 1979-07-25 Kureha Chemical Ind Co Ltd Activated carbon and its use in gastrointestinal disorders
US4178161A (en) * 1976-11-11 1979-12-11 Tenneco Chemicals, Inc. Manufacture of rigidized convoluted foam from flexible polyurethane foam and resultant product
GB2025385A (en) * 1978-07-12 1980-01-23 Sumitomo Chemical Co Activated carbon and apparatus for hemoperfusion
GB2032298A (en) * 1978-10-09 1980-05-08 Takeda Chemical Industries Ltd Adsorbent air filter
JPS5599319A (en) * 1979-01-23 1980-07-29 Bridgestone Corp Packed material with activated carbon
US4224415A (en) * 1958-07-18 1980-09-23 Rohm And Haas Company Polymerization processes and products therefrom
GB2053176A (en) * 1979-06-26 1981-02-04 Kureha Chemical Ind Co Ltd Spherical particles of activated carbon suitable for use in a pharmaceutical composition
US4296166A (en) * 1978-10-09 1981-10-20 Takeda Chemical Industries, Ltd. Air filter of polyurethane mesh containing carbon adsorbent
US4411948A (en) * 1979-04-18 1983-10-25 Takeda Chemical Industries, Ltd. Air filter of three-dimensional mesh-structured webs
US4504290A (en) * 1984-06-14 1985-03-12 Columbus Industries, Inc. Odor filter media
US4510193A (en) * 1983-02-09 1985-04-09 Bluecher Hubert Filter sheet material
JPS61103518A (en) * 1984-10-29 1986-05-22 Inoue Mtp Co Ltd Preparation of deodorizing filter
US4689058A (en) * 1986-02-07 1987-08-25 Kimberly-Clark Corporation Disposable stove hood filter
US4699681A (en) * 1978-09-08 1987-10-13 D-Mark, Inc. Method of making a gas phase permeable filter
US4758460A (en) * 1985-05-29 1988-07-19 Pipercross Limited Air filter
US4955995A (en) * 1989-07-28 1990-09-11 Columbus Industries, Inc. Range hood filter pad
US4957897A (en) * 1988-01-29 1990-09-18 Rohm And Haas Company Carbonaceous adsorbents from pyrolyzed polysulfonated polymers
US4981501A (en) * 1988-04-22 1991-01-01 Bluecher Hasso Von Adsorption filter with high air permeability
US4983192A (en) * 1982-01-14 1991-01-08 Bluecher Hubert Textile sheet filter
US5129929A (en) * 1989-05-26 1992-07-14 Pall Corporation Sorbent filtration device
US5226937A (en) * 1989-08-18 1993-07-13 Pall Corporation Void-containing sorbent pad
US5350443A (en) * 1993-04-19 1994-09-27 Bluecher Hasso Von Filter sheet material for passenger cabins in motor vehicles
US5395428A (en) * 1990-01-23 1995-03-07 Von Bluecher; Hasso Filter material for motor vehicles
US5609761A (en) * 1994-09-16 1997-03-11 Franz; Andreas Filter medium and process for making same
US5616169A (en) * 1994-06-17 1997-04-01 Hasso von Blucher Seal-free and frame-free odor and/or pollutant filter

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD63768A (en) *
FR2389381B1 (en) * 1977-05-06 1981-01-30 Takeda Chemical Industries Ltd
SU1269814A1 (en) * 1983-08-09 1986-11-15 Предприятие П/Я Р-6453 Method of cleaning gases from acid components
US4743280A (en) * 1986-03-24 1988-05-10 Pappas Phillip M Air filter apparatus
DE3819002A1 (en) * 1988-06-03 1989-12-14 Hasso Von Bluecher Air filter for passenger cells
US5001970A (en) * 1989-10-06 1991-03-26 Graver James H Grill exhaust system
DE4034798C2 (en) * 1990-11-02 1996-07-11 Sandler Helmut Helsa Werke Process for the production of an adsorption surface filter
US5232478A (en) * 1991-11-14 1993-08-03 Farris Richard W Electronic air filter
DE4304026B4 (en) * 1992-02-28 2005-02-17 Mhb Filtration Gmbh & Co. Kg Process for disposal of spent ion exchangers

Patent Citations (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE63768C (en) * Berlin-Leipziger Maschinenfabrik louis goebel & CO. in Berlin O., Alexanderstrafse 14b Machine for filing saw blades
US4224415A (en) * 1958-07-18 1980-09-23 Rohm And Haas Company Polymerization processes and products therefrom
US4224415B1 (en) * 1958-07-18 1993-07-13 Rohm & Haas
US3381454A (en) * 1962-10-11 1968-05-07 Collo Rheincollodium Koln G M Filter for absorption and adsorption of gases, vapors, odors and the like
US3519708A (en) * 1966-11-21 1970-07-07 Dow Chemical Co Method of forming selectively permeable bodies from flexible polyurethane foam
US3687297A (en) * 1969-07-04 1972-08-29 Kali Chemie Ag Shaped body for filtering and drying of liquids and gases and process of making the same
US3925248A (en) * 1971-05-11 1975-12-09 Collo Rheincollodium Koln Gmbh Filter medium for gases
US3865758A (en) * 1971-09-13 1975-02-11 Teijin Ltd Polyurethane foam filter material containing adsorbent and method of production thereof
JPS5111085A (en) * 1974-07-18 1976-01-28 Nippon Kuringeeji Kk
US4040990A (en) * 1975-02-18 1977-08-09 Rohm And Haas Company Partially pyrolyzed macroporous polymer particles having multimodal pore distribution with macropores ranging from 50-100,000 angstroms
CH597895A5 (en) * 1975-03-24 1978-04-14 Andersen 2000 Inc Filtering (sub)micron solid and liq. particles from fast gas streams
JPS51138511A (en) * 1975-05-27 1976-11-30 Sony Corp Method for regulating the hardness of metallic tita nium
GB1525420A (en) * 1975-09-04 1978-09-20 Sumitomo Chemical Co Process for producing porous carbon
US4178161A (en) * 1976-11-11 1979-12-11 Tenneco Chemicals, Inc. Manufacture of rigidized convoluted foam from flexible polyurethane foam and resultant product
GB2012257A (en) * 1977-12-27 1979-07-25 Kureha Chemical Ind Co Ltd Activated carbon and its use in gastrointestinal disorders
GB2025385A (en) * 1978-07-12 1980-01-23 Sumitomo Chemical Co Activated carbon and apparatus for hemoperfusion
US4699681A (en) * 1978-09-08 1987-10-13 D-Mark, Inc. Method of making a gas phase permeable filter
GB2032298A (en) * 1978-10-09 1980-05-08 Takeda Chemical Industries Ltd Adsorbent air filter
US4296166A (en) * 1978-10-09 1981-10-20 Takeda Chemical Industries, Ltd. Air filter of polyurethane mesh containing carbon adsorbent
JPS5599319A (en) * 1979-01-23 1980-07-29 Bridgestone Corp Packed material with activated carbon
US4411948A (en) * 1979-04-18 1983-10-25 Takeda Chemical Industries, Ltd. Air filter of three-dimensional mesh-structured webs
GB2053176A (en) * 1979-06-26 1981-02-04 Kureha Chemical Ind Co Ltd Spherical particles of activated carbon suitable for use in a pharmaceutical composition
US4983192A (en) * 1982-01-14 1991-01-08 Bluecher Hubert Textile sheet filter
US4510193B1 (en) * 1983-02-09 1989-10-24
US4510193A (en) * 1983-02-09 1985-04-09 Bluecher Hubert Filter sheet material
US4504290A (en) * 1984-06-14 1985-03-12 Columbus Industries, Inc. Odor filter media
JPS61103518A (en) * 1984-10-29 1986-05-22 Inoue Mtp Co Ltd Preparation of deodorizing filter
US4758460A (en) * 1985-05-29 1988-07-19 Pipercross Limited Air filter
US4689058A (en) * 1986-02-07 1987-08-25 Kimberly-Clark Corporation Disposable stove hood filter
US4957897A (en) * 1988-01-29 1990-09-18 Rohm And Haas Company Carbonaceous adsorbents from pyrolyzed polysulfonated polymers
US4981501A (en) * 1988-04-22 1991-01-01 Bluecher Hasso Von Adsorption filter with high air permeability
US5129929A (en) * 1989-05-26 1992-07-14 Pall Corporation Sorbent filtration device
US4955995A (en) * 1989-07-28 1990-09-11 Columbus Industries, Inc. Range hood filter pad
US5226937A (en) * 1989-08-18 1993-07-13 Pall Corporation Void-containing sorbent pad
US5395428A (en) * 1990-01-23 1995-03-07 Von Bluecher; Hasso Filter material for motor vehicles
US5350443A (en) * 1993-04-19 1994-09-27 Bluecher Hasso Von Filter sheet material for passenger cabins in motor vehicles
US5350443B1 (en) * 1993-04-19 1998-05-05 Hasso Von Bluecher Filter sheet material for passenger cabins in motor vehicles
US5350443B2 (en) * 1993-04-19 1999-08-10 Von Hasso Bluecher Filter sheet material for passenger cabins in motor vehicles
US5616169A (en) * 1994-06-17 1997-04-01 Hasso von Blucher Seal-free and frame-free odor and/or pollutant filter
US5609761A (en) * 1994-09-16 1997-03-11 Franz; Andreas Filter medium and process for making same

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6024782A (en) * 1996-11-15 2000-02-15 Dragerwerk Ag Layered gas filter media
WO1999036172A1 (en) * 1998-01-20 1999-07-22 Naiad Technologies, Inc. Activated charcoal and open cell foam filtration material, and apparatus and methods of using the same
US6302946B1 (en) * 1998-08-17 2001-10-16 Flanders Corporation Deodorizing air filter and method of fabricating same
US20040154470A1 (en) * 1998-08-20 2004-08-12 Extraction Systems, Inc Filters employing porous strongly acidic polymers
US6447584B1 (en) * 1998-08-20 2002-09-10 Extraction Systems, Inc. Filters employing porous strongly acidic polymers
US7022164B2 (en) 1998-08-20 2006-04-04 Mykrolis Corporation Filters employing porous strongly acidic polymers
US6610128B2 (en) * 1998-08-20 2003-08-26 Extraction Systems, Inc. Filters employing porous strongly acidic polymers
US20060169139A1 (en) * 2000-05-05 2006-08-03 Extraction Systems, Inc. Filters employing both acidic polymers and physical-adsorption media
US20020178923A1 (en) * 2000-05-05 2002-12-05 Extraction Systems, Incorporated Filters employing both acidic polymers and physical-absorption media
US6761753B2 (en) 2000-05-05 2004-07-13 Extraction Systems, Inc. Methods using filters employing both acidic polymers and physical-adsorption media
US7540901B2 (en) 2000-05-05 2009-06-02 Entegris, Inc. Filters employing both acidic polymers and physical-adsorption media
US6740147B2 (en) 2000-05-05 2004-05-25 Extraction Systems, Inc. Filters employing both acidic polymers and physical-adsorption media
USRE44536E1 (en) 2000-05-05 2013-10-15 Entegris, Inc. Filters employing both acidic polymers and physical-adsorption media
US6709499B2 (en) * 2000-06-15 2004-03-23 Bsh Bosch Und Siemens Hausgeraete Gmbh Air-routing household appliance with a washable filter
WO2001096648A1 (en) * 2000-06-15 2001-12-20 BSH Bosch und Siemens Hausgeräte GmbH Air-circulating domestic appliance comprising a washable filter
US20050000363A1 (en) * 2001-09-21 2005-01-06 Shinichi Minemura Adsorptive sheet and filter for clarifying air
US6936094B2 (en) * 2001-09-21 2005-08-30 Toyo Boseki Kabushiki Kaisha Adsorptive sheet and filter for clarifying air
US6840986B1 (en) * 2002-02-22 2005-01-11 Koslow Technologies Corporation Air purifying filter systems for building air supply and respirators useful against NBC attacks
US20040255785A1 (en) * 2002-02-22 2004-12-23 Koslow Evan E. Air purifying filter systems for building air supply and respirators useful against nbc attacks
US20050154379A1 (en) * 2003-01-31 2005-07-14 Innovatech Surgical, Inc. Adjustable laser probe for use in vitreoretinal surgery
US7766904B2 (en) * 2003-01-31 2010-08-03 Iridex Corporation Adjustable laser probe for use in vitreoretinal surgery
US20080017036A1 (en) * 2004-03-01 2008-01-24 Eurofilters N.V. Adsorbing Agent, Dust Collection Chamber And Method For Adsorbing Odours
US7582142B2 (en) * 2004-03-01 2009-09-01 Eurofilters N.V. Absorbing agent, dust collection chamber and method for adsorbing odours
US20050241479A1 (en) * 2004-04-28 2005-11-03 Foamex L.P. Filter materials for absorbing hydrocarbons
US20050241480A1 (en) * 2004-04-28 2005-11-03 Lebowitz Jeffrey L Filter material absorb hydrocarbon
US20060205830A1 (en) * 2004-04-28 2006-09-14 Foamex L.P. Filter materials for adsorbing hydrocarbons
US7597745B2 (en) 2004-04-28 2009-10-06 Foamex Innovations Operating Company Filter materials for adsorbing hydrocarbons
WO2005120594A1 (en) * 2004-06-07 2005-12-22 Dow Global Technologies Inc. Polymers with odor control properties and method for their preparation
US20060189475A1 (en) * 2005-02-23 2006-08-24 Petrik Viktor I Compositions and methods for recycling of nanostructured sorbents
US20070078193A1 (en) * 2005-08-31 2007-04-05 Gilder Stephen D Strut-reinforced, reduced VOC polyurethane foam
US20070066697A1 (en) * 2005-08-31 2007-03-22 Gilder Stephen D Strut-reinforced polyurethane foam
US20100174006A1 (en) * 2005-09-20 2010-07-08 Sleep Innovations, Inc. Strut-Reinforced, Reduced VOC Polyurethane Foam
US20090320681A1 (en) * 2006-07-13 2009-12-31 Entegris, Inc. Filtering system for a semiconductor processing tool
US7922791B2 (en) 2006-07-13 2011-04-12 Entegris, Inc. Filtering system for a semiconductor processing tool
US20100162888A1 (en) * 2007-06-08 2010-07-01 Bluecher Hasso Von Mat-shaped foam material for cleaning and/or filtering air
US20090158928A1 (en) * 2007-12-19 2009-06-25 Whirlpool Corporation Squeezable moisture removal device
US20140013942A1 (en) * 2012-07-13 2014-01-16 Advanced Fuel Research, Inc. Carbon sorbent for reversible ammonia sorption
US9073039B2 (en) * 2012-07-13 2015-07-07 Adavanced Fuel Research, Inc. Carbon sorbent for reversible ammonia sorption
US10195470B2 (en) 2013-03-15 2019-02-05 Oy Halton Group Ltd. Water spray fume cleansing with demand-based operation
US10022200B2 (en) 2014-08-25 2018-07-17 Peregrine Surgical, Ltd Microsurgical instrument
US11285421B2 (en) * 2018-04-12 2022-03-29 Electrolux Home Products, Inc. Filter media for filtration of cooking fumes
RU206834U1 (en) * 2021-04-07 2021-09-29 Федеральное государственное бюджетное образовательное учреждение высшего образования «Казанский государственный энергетический университет» Granular filter with porous granules
RU210049U1 (en) * 2021-11-19 2022-03-25 Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный энергетический университет" Granular filter with perforated granules for gas cleaning

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ITMI951206A1 (en) 1996-12-08
DE19521665A1 (en) 1996-01-11
FR2721233A1 (en) 1995-12-22
JPH08187415A (en) 1996-07-23
FR2721233B1 (en) 1998-10-02
GB2290727B (en) 1998-04-08
SE515506C2 (en) 2001-08-20
SE9502084L (en) 1995-12-18
GB2290727A (en) 1996-01-10
GB9512308D0 (en) 1995-08-16
SE9502084D0 (en) 1995-06-07
ITMI951206A0 (en) 1995-06-08
DE19521665C2 (en) 2002-04-25
IT1276678B1 (en) 1997-11-03

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